CN220604733U - Battery cell and battery - Google Patents

Abstract

The utility model discloses a battery cell and a battery, wherein the battery cell comprises a rolled positive plate, a negative plate and a diaphragm, the positive plate comprises a first current collector, the first current collector is provided with two insulated first conductive layers, the first conductive layers are respectively provided with a first empty foil area, the first empty foil areas are respectively connected with a positive tab, the negative plate comprises a second current collector, the second current collector is provided with two insulated second conductive layers, the second conductive layers are respectively provided with a second empty foil area, the second empty foil areas are respectively connected with a negative tab, and one positive tab is connected with one negative tab. According to the utility model, the multipolar lug battery core can be manufactured through the plurality of first conductive layers and the plurality of second conductive layers, one positive lug and one negative lug are used as output lugs, and the other positive lug and the other negative lug are connected in series inside the battery core, so that the output voltage of the battery core is improved, the output voltage is not required to be improved in a mode of connecting a plurality of battery cores in series outside, and the utilization rate of the internal space of the battery is improved.

Description

Battery cell and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery.

Background

The battery cell is generally composed of a positive plate, a negative plate and a diaphragm, the positive plate and the negative plate are separated by the diaphragm to form the battery cell, the average output voltage of the single battery cell is generally between 3 and 4V, and the output voltage is low. In order to meet the use requirements of electric equipment (such as an electric vehicle), the existing battery is used for improving output voltage by connecting a plurality of electric cores in series. However, the prior art has the following drawbacks: the battery needs to be connected with a plurality of battery cells in series through a connecting piece (such as a bus plate), and the connecting piece occupies the internal space of the battery, so that the utilization rate of the internal space of the battery is low, and the volumetric energy density loss of the battery is large.

Disclosure of Invention

One object of an embodiment of the utility model is to: the battery cell is simple in structure and capable of effectively improving output voltage.

Another object of an embodiment of the utility model is to: provided is a battery having a high single cell output voltage, which can improve the internal space utilization.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, there is provided a cell comprising:

the positive plate comprises a first current collector, wherein the first current collector is provided with two first conductive layers, the two first conductive layers are arranged in an insulating way, the first conductive layers are provided with a first coating area and a first empty foil area, and the first empty foil areas are connected with a positive lug;

the negative plate comprises a second current collector, two insulating second conductive layers are arranged on the second current collector, the two second conductive layers are arranged in an insulating mode, the second conductive layers are provided with a second coating area and a second empty foil area, the second empty foil areas are connected with a negative electrode lug, and one positive electrode lug is connected with one negative electrode lug one by one;

and the diaphragm is arranged between the positive plate and the negative plate, and the positive plate, the diaphragm and the negative plate are stacked and wound.

As a preferred embodiment of the battery cell, the projections of the positive electrode tab and the negative electrode tab on the battery cell are staggered at least along the X direction.

As a preferable scheme of the battery cell, the output voltage of the battery cell is 6V-8V.

As a preferable scheme of the battery cell, a first insulating layer is arranged between the two first conductive layers, and the first insulating layer is used for insulating the two first conductive layers;

a second insulating layer is arranged between the two second conductive layers, and the second insulating layer is used for insulating the two second conductive layers.

As a preferable scheme of the battery cell, the first conductive layer and the second conductive layer are both metal layers, and the first insulating layer and the second insulating layer are PET layers or PP layers or PI layers.

As a preferred scheme of the battery cell, the first empty foil areas on the two first conductive layers are corresponding or staggered; the second empty foil areas on the two second conductive layers correspond or are staggered.

As a preferable scheme of the battery cell, the first current collector is provided with a first end along the length direction of the first current collector, the first end is positioned on the outer ring of the battery cell, two side surfaces of the first current collector along the thickness direction are provided with third empty foil areas, and the third empty foil areas are positioned on the first end.

As a preferred embodiment of the battery cell, the third hollow foil region overlaps the first hollow foil region or the third hollow foil region is offset from the first hollow foil region.

As a preferred solution of the cell, the first current collector further has a second end opposite to the first end, the second end is located in the middle of the cell, and the first empty foil area is located at the first end.

As a preferred embodiment of the battery cell, the length of the third hollow foil area facing the outside of the battery cell is greater than the length of the third hollow foil area facing the inside of the battery cell.

As a preferable scheme of the battery cell, the second current collector is provided with a fourth end along the length direction of the second current collector, the fourth end is positioned in the middle of the battery cell, and both side surfaces of the second current collector along the thickness direction are provided with fourth empty foil areas.

As a preferred embodiment of the battery cell, the third empty foil region coincides with the fourth empty foil region, or the third empty foil region is offset from the fourth empty foil region.

As a preferred embodiment of the battery cell, the length of the fourth hollow foil area facing the inside of the battery cell is greater than the length of the fourth hollow foil area facing the outside of the battery cell.

In a second aspect, a battery is provided, including a housing and the above-described battery cell, the battery cell being disposed within the housing.

The beneficial effects of the utility model are as follows: through setting up a plurality of insulating first conducting layers at first mass flow body, the second mass flow body is provided with a plurality of insulating second conducting layers, the quantity of first conducting layer and second conducting layer is the same, and every first conducting layer all is provided with an anodal ear, every second conducting layer all is provided with a negative pole ear, the electric core of coiling and making is equivalent to integrating a plurality of electric cores that have single anodal ear and single negative pole ear, and through regard one of them anodal ear and one of them negative pole ear as the output utmost point ear of electric core, the anodal ear and the negative pole ear one-to-one of remaining are connected, namely for connecting a plurality of electric cores series connection that have single anodal ear and single negative pole ear, thereby the output voltage of electric core has been improved. Therefore, the battery does not need to boost the output voltage in a mode of connecting a plurality of electric cores in series outside, and the utilization rate of the internal space of the battery can be improved, so that the volume energy density of the battery is improved.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model.

Fig. 2 is a first view of a positive electrode sheet according to an embodiment of the present utility model.

Fig. 3 is a second view of a positive electrode sheet according to an embodiment of the present utility model.

Fig. 4 is a third view of a positive electrode sheet according to an embodiment of the present utility model.

Fig. 5 is a first view of a negative electrode sheet according to an embodiment of the present utility model.

Fig. 6 is a second view of a negative electrode sheet according to an embodiment of the present utility model.

Fig. 7 is a third view of a negative electrode sheet according to an embodiment of the present utility model.

In the figure:

1. a positive plate; 11. a first current collector; 111. a first insulating layer; 112. a first conductive layer; 113. a first end; 114. a second end; 12. a first active material layer; 13. a first empty foil region; 14. a third empty foil region; 2. a negative electrode sheet; 21. a second current collector; 211. a second insulating layer; 212. a second conductive layer; 213. a third end; 214. a fourth end; 22. a second active material layer; 23. a second empty foil region; 3. a positive electrode tab; 4. a negative electrode ear; 5. a diaphragm.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 7, the battery cell provided by the utility model comprises a positive plate 1, a negative plate 2 and a diaphragm 5, wherein the diaphragm 5 is arranged between the positive plate 1 and the negative plate 2, and the positive plate 1, the diaphragm 5 and the negative plate 2 are stacked and wound to form a winding type battery cell.

The positive plate 1 includes a first current collector 11, the first current collector 11 is provided with two first conductive layers 112, the two first conductive layers 112 are arranged in an insulating manner, that is, electrons are not conducted between the two first conductive layers 112, the first conductive layers 112 are provided with a first coating area and a first empty foil area 13, the first coating area is provided with a first active material layer 12, the first empty foil area 13 is connected with a positive tab 3, the positive plate 1 includes a second current collector 21, the second current collector 21 is provided with two second conductive layers 212, the two second conductive layers 212 are arranged in an insulating manner, the second conductive layers 212 are provided with a second coating area and a second empty foil area 23, the second coating area is provided with a second active material layer 22, the second empty foil area 23 is connected with a negative tab 4, one positive tab 3 is connected with one negative tab 4, and the other positive tab 3 and the other negative tab 4 serve as output tabs of an electric core.

It can be understood that one first conductive layer 112 and one second conductive layer 212 can form a battery core corresponding to one single positive electrode ear and one single negative electrode ear, so that two insulating first conductive layers 112 and second conductive layers 212 are arranged inside the battery core, and two battery cores corresponding to the single positive electrode ear and the single negative electrode ear are integrated inside the battery core, wherein one positive electrode ear 3 and one negative electrode ear 4 serve as output electrode ears of the battery core and are used for connecting external electric equipment, the other positive electrode ear 3 and the other negative electrode ear 4 are correspondingly connected to be connected inside the battery core in series, and the battery core is equivalent to the battery core of connecting a plurality of single positive electrode ears and single negative electrode ears in series, so that the output voltage of the battery core is improved. Compared with the prior art, the battery does not need to meet the use requirement of electric equipment in a mode of connecting a plurality of battery cores in series outside, and can avoid occupying the internal space of the battery, so that the utilization rate of the internal space of the battery is improved, and the volume energy density of the battery is improved.

Specifically, the output voltage of the battery cell with the structure can reach 6V-8V after multiple test tests, and the output voltage is effectively improved.

Specifically, the projections of the positive electrode tab 3 and the negative electrode tab 4 on the battery cell are staggered at least along the X direction (X direction in fig. 1), so as to facilitate connection of the positive electrode tab 3 and the negative electrode tab 4.

Further, the first empty foil areas 13 on the two first conductive layers 112 are corresponding or staggered; the second empty foil areas 23 on the two second conductive layers 212 correspond or are staggered.

For example, the first empty foil areas 13 on the two first conductive layers 112 correspond to each other, the two positive electrode tabs 3 are arranged on the positive electrode sheet 1 in a staggered manner at intervals, the second empty foil areas 23 on the two second conductive layers 212 correspond to each other, the two negative electrode tabs 4 are arranged on the negative electrode sheet 2 in a staggered manner at intervals, and when the positive electrode sheet 1 and the negative electrode sheet 2 are stacked, the two positive electrode tabs 3 and the two negative electrode tabs 4 are arranged in a staggered manner so as to meet the condition that the projections of the wound positive electrode tabs 3 and the wound negative electrode tabs 4 in the X direction are not overlapped.

Specifically, a first insulating layer 111 is provided between the first conductive layers 112, and the first insulating layer 111 insulates between the two first conductive layers 112; a second insulating layer 211 is disposed between the two second conductive layers 212, and the second insulating layer 211 is used for insulating the two second conductive layers 212.

Optionally, the first conductive layer 112 and the second conductive layer 212 are both metal layers. Illustratively, the first conductive layer 112 is an aluminum foil layer and the second conductive layer 212 is a copper foil layer.

Alternatively, the first insulating layer 111 and the second insulating layer 211 are organic insulating layers, such as a PET layer (a polyethylene terephthalate layer) or a PP layer (a polypropylene layer) or a PI layer (a polyimide layer).

The insulating layer can be used as a substrate layer to support the conductive layer, and the thickness of the conductive layer is reduced as much as possible under the condition of ensuring the mechanical strength of the conductive layer, so that the thickness of the active material layer is increased, and the energy density of the battery cell is further improved. By way of example, conductive layers are deposited on the upper and lower surfaces of the insulating layer by vacuum plating or the like to maximize the integration of the advantages between the different materials by recombination between the different materials.

Specifically, after being wound into a battery cell, both the two positive electrode tabs 3 and the two negative electrode tabs 4 of the battery cell are partially extended to the outside of the battery cell so as to be connected. For example, one of the positive electrode tabs 3 and one of the negative electrode tabs 4 are connected through a battery protection plate, so as to prevent the battery cell from being damaged and prolong the service life of the battery cell, and the other positive electrode tab 3 and the other negative electrode tab 4 are used as battery cell output electrode tabs.

Specifically, referring to fig. 1, 2 and 5, the first current collector 11 has a first end 113 and a second end 114 along its length direction, the second current collector 21 has a third end 213 and a fourth end 214 along its length direction, the second end 114 and the fourth end 214 may be winding ends of the positive electrode sheet 1 and the negative electrode sheet 2, respectively, the first end 113 and the third end 213 may be winding start ends of the positive electrode sheet 1 and the negative electrode sheet 2, respectively, the positive electrode sheet 1 wraps the negative electrode sheet 2 to wind, after winding into a winding core, the first end 113 and the third end 213 are located on an outer ring of the battery core, and the second end 114 and the fourth end 214 are located in a middle portion of the battery core.

Referring to fig. 1 to 4, the first current collector 11 is provided with third empty foil regions 14 on two sides in the thickness direction, and the third empty foil regions 14 are located at the second end 114, that is, the third empty foil regions 14 are located at the outer ring of the cell. The third hollow foil region 14 is not coated with active material to facilitate winding and ensure uniformity of cell thickness.

Further, referring to fig. 1, the end of the separator 5 extends to the outside of the fourth end 214 to avoid the first conductive layer 112 of the negative electrode sheet 2 from leaking out and contacting the third empty foil region 14, preventing lithium precipitation.

Alternatively, as shown in fig. 2 to 4, the length of the third hollow foil region 14 facing the outside of the cell is greater than the length of the third hollow foil region 14 facing the inside of the cell. Wherein, the side of the third hollow foil region 14 facing the outside of the battery cell away from the first end 113 is flush with the side of the third hollow foil region 14 facing the inside of the battery cell away from the first end 113.

In the outer lane of electric core, the side of second end 114 towards the electric core inboard sets up with negative pole piece 2 relatively, and the side of second end 114 towards the electric core inboard needs to set up first active material layer 12 to react with the active material layer on the negative pole piece 2 side that it just faces, in order to avoid taking place to separate lithium, and second end 114 is towards the electric core outside and not set up with negative pole piece 2 relatively, need not to set up first active material layer 12, in order to reduce the material of first active material layer 12, guarantee the uniformity of electric core thickness.

Of course, in other embodiments, the length of the first empty foil region 13 towards the outside of the cell is the same as the length of the first empty foil region 13 towards the inside of the cell.

Optionally, the third empty foil region 14 overlaps the first empty foil region 13, i.e. the positive tab 3 is located at the second end 114; or the third empty foil region 14 is staggered from the first empty foil region 13, that is, the positive tab 3 is located at a position of the positive plate 1 except the first end 113.

In this embodiment, as shown in fig. 1 to 4, the third empty foil region 14 is offset from the first empty foil region 13, the first empty foil region 13 is located at the first end 113, and the third empty foil region 14 is located at the second end 114. Specifically, the two positive electrode lugs 3 are respectively arranged on the first empty foil areas 13 at two sides of the second end 114, and the two positive electrode lugs 3 are staggered. The connection of the positive electrode lug 3 and the positive electrode plate 1 does not need to carry out the operation of cleaning the first active material layer 12 to form the groove, so that the process flow is greatly simplified, and the production and manufacturing efficiency is improved. In addition, because the first positive electrode empty foil area is reserved at the end part of the positive electrode plate 1, the end part material returning work is not needed, the problems of poor consistency of battery thickness, poor adhesion of material returning positions, lithium precipitation at the later stage of battery circulation and the like caused by material returning are reduced, and therefore, the prepared winding core structure has higher safety performance and longer service life, the internal resistance of the battery is greatly reduced, and the charging speed is obviously improved.

Specifically, referring to fig. 1 and 5 to 7, the third end 213 is provided with fourth empty foil regions on both sides in the thickness direction thereof. The fourth empty foil area is positioned in the middle of the battery cell. Since the second active material layer 22 is not provided at the second empty foil region 23, the winding and forming of the battery cell can be facilitated.

Optionally, the length of the fourth empty foil area facing the inside of the cell is greater than the length of the fourth empty foil area facing the outside of the cell. Wherein the sides of the two fourth empty foil areas remote from the fourth end 214 are flush. Referring to fig. 1, the negative electrode plate 2 is located at the innermost ring of the battery core, the surface of the third end 213 facing the inner side of the battery core does not have the positive electrode plate 1 to react with the positive electrode plate, and the second active material layer 22 is not needed to be arranged, so as to reduce the material consumption of the second active material of the negative electrode plate 2 and ensure the consistency of the thickness of the battery core, while the surface of the third end 213 facing the outer side of the battery core is opposite to the positive electrode plate 1, and the second active material layer 22 is needed to be arranged, so as to avoid the problem of lithium precipitation between the fourth empty foil region and the first active material layer 12.

Of course, in other embodiments, the length of the fourth empty foil region facing the inner side of the cell and the length of the fourth empty foil region facing the outer side of the cell may be the same, so long as the fourth empty foil region and the first active material layer 12 do not have a lithium precipitation problem after winding.

Optionally, the second empty foil area 23 coincides with the fourth empty foil area, i.e. the negative electrode tab 4 is located at the third end 213, or the second empty foil area 23 is offset from the fourth empty foil area.

In the present embodiment, as shown in fig. 1 and fig. 5 to fig. 7, the second empty foil area 23 coincides with the fourth empty foil area, i.e. the second empty foil area 23 is the fourth empty foil area. This design can facilitate winding without having to provide a separate foil region, can increase the duty cycle of the second active material layer 22, and helps to increase the capacity of the cell.

The utility model also provides a battery, which comprises a shell and the battery cell of any embodiment, wherein the battery cell is arranged in the shell. The battery has high output voltage, can meet the use requirement of electric equipment, does not need to be connected with a plurality of battery cores in series through the connecting piece to improve the output voltage, and therefore, the utilization rate of the internal space of the battery is improved, and the volume energy density of the battery is improved.

Specifically, the battery is a lithium ion battery.

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (14)

1. A cell, comprising:

the positive plate comprises a first current collector, wherein the first current collector is provided with two first conductive layers, the two first conductive layers are arranged in an insulating way, the first conductive layers are provided with a first coating area and a first empty foil area, and the first empty foil areas are connected with a positive lug;

the negative plate comprises a second current collector, two second conductive layers are arranged on the second current collector, insulation is arranged between the two second conductive layers, the second conductive layers are respectively provided with a second coating area and a second empty foil area, the second empty foil areas are respectively connected with a negative electrode lug, and one positive electrode lug is connected with one negative electrode lug;

and the diaphragm is arranged between the positive plate and the negative plate, and the positive plate, the diaphragm and the negative plate are stacked and wound.

2. The cell of claim 1, wherein the positive tab and the negative tab are offset in projection on the cell at least along the X-direction.

3. The cell of claim 1, wherein the output voltage of the cell is 6V to 8V.

4. The cell of claim 1, wherein a first insulating layer is disposed between the two first conductive layers, the first insulating layer being configured to insulate between the two first conductive layers;

a second insulating layer is arranged between the two second conductive layers, and the second insulating layer is used for insulating the two second conductive layers.

5. The cell of claim 4, wherein the first and second conductive layers are metal layers and the first and second insulating layers are PET layers or PP layers or PI layers.

6. The cell of claim 4, wherein the first empty foil areas on both of the first conductive layers correspond to or are staggered; the second empty foil areas on the two second conductive layers correspond or are staggered.

7. The cell according to any one of claims 1 to 6, wherein the first current collector has a first end in a longitudinal direction thereof, the first end being located at an outer periphery of the cell, and third empty foil areas are provided on both sides of the first current collector in a thickness direction, the third empty foil areas being located at the first end.

8. The cell of claim 7, wherein the third empty foil region overlaps the first empty foil region or the third empty foil region is staggered from the first empty foil region.

9. The cell of claim 7, wherein the first current collector further has a second end opposite the first end, the second end being located in a middle portion of the cell, the first empty foil region being located at the first end.

10. The cell of claim 7, wherein the length of the third hollow foil region toward the outside of the cell is greater than the length of the third hollow foil region toward the inside of the cell.

11. The cell according to any one of claims 1 to 6, wherein the second current collector has a fourth end along its length direction, the fourth end being located in the middle of the cell, and fourth empty foil areas are provided on both sides of the second current collector along the thickness direction.

12. The cell of claim 11, wherein the second empty foil region coincides with the fourth empty foil region or the second empty foil region is staggered from the fourth empty foil region.

13. The cell of claim 11, wherein the length of the fourth empty foil area towards the inside of the cell is greater than the length of the fourth empty foil area towards the outside of the cell.

14. A battery comprising a housing and the cell of any one of claims 1 to 13, the cell being disposed within the housing.